Its possible you may not have a clue what drives the reformed.. The reformed run the gamut from salvation by works(various types(Armenian)) to salvation by faith(various types(Calvinist, more or less))..
Roman Catholic and EO (and others) seem to be Arminianists...
Working their way to heaven.. A hard job if you can get it..
I am of course neither..
How can they be something that came after them? Don't be silly.
Who cares what drives them?